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15
Math.TechQA.Club
2026-03-27 01:57:26
90
Views
Find the cardinality of this set
Published on
27 Mar 2026 - 1:57
#elementary-set-theory
424
Views
Transformation of functions and group action
Published on
02 Apr 2026 - 5:54
#group-theory
#elementary-set-theory
#linear-transformations
284
Views
Trouble Proving The Principle of Duality with Regards to Sets
Published on
13 Mar 2026 - 5:00
#elementary-set-theory
48
Views
Show that the mapping $B\rightarrow I_{B}:P(A)\rightarrow 2^{A}$ is a bijection
Published on
12 Mar 2026 - 17:23
#elementary-set-theory
134
Views
Number of possible equivalence relations
Published on
09 Apr 2026 - 2:08
#discrete-mathematics
#elementary-set-theory
#equivalence-relations
32
Views
Possibly uncountable subset of the power set of the naturals
Published on
13 Mar 2026 - 10:46
#elementary-set-theory
209
Views
Empty set NOT an element of a relation R={}?
Published on
12 Mar 2026 - 17:53
#elementary-set-theory
98
Views
Membership relation
Published on
26 Mar 2026 - 13:38
#elementary-set-theory
38
Views
Order relation proof ...
Published on
02 Apr 2026 - 1:36
#discrete-mathematics
#elementary-set-theory
#relations
#order-theory
278
Views
What does this "\" mathematics symbol mean?
Published on
07 Apr 2026 - 5:51
#elementary-set-theory
#notation
45
Views
Why a set or vector start counting from a negative or zero index?
Published on
08 Apr 2026 - 22:24
#elementary-set-theory
#notation
#vectors
74
Views
Why do I need boundedness for a a closed subset of $\mathbb{R}$ to have a maximum?
Published on
06 Apr 2026 - 23:27
#real-analysis
#elementary-set-theory
#examples-counterexamples
#real-numbers
#maxima-minima
119
Views
Is my proof correct that set $A$ is a subset of $f^{-1}[f[A]]?$
Published on
24 Mar 2026 - 19:01
#elementary-set-theory
#proof-verification
#proof-writing
1.9k
Views
Why is the image of the pre-image of B, a subset of B?
Published on
24 Mar 2026 - 19:08
#elementary-set-theory
#proof-verification
#proof-writing
347
Views
How to say that there may exist elements in two sets such that their intersection is not null?
Published on
04 Apr 2026 - 7:50
#elementary-set-theory
#notation
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